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x in (-oo:+oo)
X+(1/2)*x+x+x-46-35 = 0
X+5/2*x-81 = 0 // - X-81
5/2*x = -(X-81) // : 5/2
x = (-(X-81))/5/2
x = 2/5*(81-X)
x = 2/5*(81-X)
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